﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MTGProject
{
    public interface ISubject
    {
        void RegisterObserver(IObserver observer);
        void RemoveObserver(IObserver observer);
    }

    public interface IObserver
    {
        void Update(Observation message, object sender, object cause);
    }

    public enum Observation
    {
        CARD_REMOVED,
        CARD_ADDED
    }
}
